Preparation method and application of diphenyl carbonate synthesis catalyst

Abstract

The invention discloses a method for preparing a catalyst for the synthesis of diphenyl carbonate. The catalyst belongs to metal-organic framework compounds. The catalyst is composed of organic ligand trimesic acid and zinc-copper double metal ions to coordinate to form an organic framework catalyst. It is non-corrosive Non-toxic and pollution-free, the catalyst is used to catalyze the synthesis of diphenyl carbonate from methyl carbamate and phenol. It has high selectivity to the target product, good catalyst stability, easy regeneration, and can be reused more than three times. The yield of phenyl ester is not significantly reduced, the skeleton structure is basically kept intact, and it is easy to separate and recycle; it has a good application prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst for synthesizing diphenyl carbonate, in particular to a zinc-copper bimetal organic framework catalyst for synthesizing diphenyl carbonate from methyl carbamate and phenol and a preparation method thereof. Background technique [0002] Diphenyl carbonate is an important intermediate in the synthesis of polycarbonate, which can be used in the synthesis of isocyanate, polyparacarbonyl benzoate, polyaryl carbonate, and can also be used as a plasticizer, solvent and heat carrier for polyester, etc. . At present, the main methods of synthesizing diphenyl carbonate are: phosgene method, oxidative carbonylation method, transesterification method and so on. The raw material phosgene of the phosgene method is highly toxic and corrosive, and it is used for the synthesis of diphenyl carbonate. Difficult to remove; transesterification methods mainly include dimethyl carbonate and phenol ...

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Problems solved by technology

Organic titanates are sensitive to moisture, have poor stability, and have low industrial application value; alkali or alkali metal compounds and Lewis acid catalysts have low catalytic activity and target product selectivity, and are corrosive, making it difficult to achieve industrial applications; Mg -Al hydrotalcite has high catalytic activity, but because the basicity of the catalyst promotes the formation of anisole at the same time, the selectivity of the target product is low; the microporous molecular sieve with a small silicon-aluminum ratio has strong acidity and good catalytic activity, but It also makes the by-product anisole easier to generate, therefore, the target product selectivity of the transesterification reaction is also very low